$\left(x+2\right)y'=9y$
$\tan\left(x\right)+\sec\left(x\right)=\frac{1+\sin\left(x\right)}{\cos\left(x\right)}$
$f\left(x\right)=50\left(x-3\right)$
$\frac{\left(x+10\right)}{x+8}<2$
$\left(1+\tan^2x\right)\tan^2x$
$10x^3-3x,\:x=2$
$\left(4c^3-5\right)^2$
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